Breather for engines.



N. MOCARTY.

BREATHBR FOR ENGINES.

APPLICATION EILED Mum, 1912.

1,071,328 Patented Aug. 26, 1913.

2 SHEETS-SHEET l.

@IMM/hud breather.

STATES NORMAN Nocan'rr, or INDIANAPOLIS, INDIANA, nssIeNon To Droits-earns icoivrreNr, or INDIANAPOLIS, INDIANA, a conrona'rIoN or INDmNa.

y encarnan Iron' ENGINES.

Imanes.

Specification of Letters Tatent.

Application led'May 27,1912. Serial No. 700,030.

this. rise and fall of pressure for'the pur-y pose of continuously and noiselessly changing the air in the crank chambers of such engines, thus producing `a ventilation having a beneficiall cooling edect.

l accomplish. this object by the use of a breather. By thisbreather the heated air in the crank case, when compressed by a stroke of the piston toward the crank case,

is allowed to escape noiselessly into the at-- mosphere, being purified of oil or other fluid.` before being discharged into the atmosphere. 'This oil is collected and is drawn back into the crankcase by the suction produced by the piston stroke in the opposite direction.

rlhe accompanying drawings illust-rate my invention.

lln the drawings, Figure 1 is a semidia lgrammatie view of an internal combustion engine having a crank.- chamber and equipped with my breather; and Fig. 2 is a vertical longitudinal section through the rlhe engine l@ is of the internal combustion type having a closed but not tight crank chamber 11 the bottom of which forms an oil well 12, ,the cranks on the engine shaft V13, which carries a dy wheel 14,

dipping into the oil in the oil well12 as the shaftrotates. The oil in theoil well 1 2v sat about the level indicated. The breather 15 is connected to the crank lchamber near the top thereof by a pipe 16,'and

lto the oil well/12 below the oily level therein by a pipe 17, in which is a' check valve 18 which opens toward the oil well..

The breatherl comprises anouter casing.

be adjusted by varying the compression of the spring 22. The cover 23 of the casing 2O has a depending annulus 2d which eX- tends nearly to the bottom of fthe casing 20, and an upwardly projecting annulus 25 lfrom the top of which a screen 26 in the shape of an inverted lcone Ydepends into the annulus 24. dn upwardly flaring 'flange 30 extends from the annulus 25 at an intermediate point in its height, forming between it and such annulus a circular groove' 31 which drains into a pocket 32, from which a pipe 33 leads to the pipe 17. lWhile for simplicity of drawing, the pocket 32 and pipe 33ers ,shown in Fig. 2 as being located on the opposite side of the breather from the pipes 16 and 17, their location may be anything desired. Mounted on .the top of flange 30 is a cap 35, the inner surface of which curves inwardly into an annular groove 36 from which a drain pipe 37 leads into the space above a baille plate 38 sup ported from the cap over the top of the screen 26. 'lhe bale plate 38 is in the shape of a rather flat inverted cone, and is provided with a drain pipe 39 discharging into the pocket B2. From the top of the cap 35 projects 'a pipe d() which discharges the air into the atmosphere.

When the engine 10 is operating, the piston movements vary the pressure of the air within the crank chamber 11. els a pist-on moves downwardly, the air .within such crank chamber is compressed and forced through the pipe 15 and check valve 2l into the casing 2D of the breather l5. rlhe air asses down within such casing around the ower edge ofthe annulus 24, which serves as a baille plate and collects some of the oil which the air discharged from the crank case is carrying. This oil drips into the bottom .of the casing 20. lhe air after pass ing around the bottom edge of the annulus 24'passes up within such aunulus, going through the conical screen 26 in such passage. The screen 26 removes more oil from the air, such oil dripping from the lower end of such screen into theV bottom of the 20. After passing' up through the casing annu us 24, the screen 26, and the annulus 25, the air strikes the conical baliie plate 88, and is by it deflected outwardly against son of the meanderings ot the air in its pas sages through the breather, this discharge is practically noiseless. Y

The oil trom the batHe plate 38 drains through the pipe 39 into'the pocket 32, into which also drains the oil collected on the walls of the tlange 30 and cap 35. rlhis oil passes from the pocket 32 through the pipe into the pipe 17. When the piston of the engine makes an upstroke, the air in the crank chamber 11 is rare-tied.. The check valve 21 prevents any air trom being drawn' back into the crank chamber through the pipe 16. In consequence, the excess pressure within the casing 2O over that within they'crank chamber tends to :force the oil in the bottom of such casing through the pipe 17 and check valve 18 back into the oil well 12. This excess pressure is preferably not sutticient to torce any airthrough the pipe 17, the head of the oil above the pipe 17 being sutticient to over-balance this excess of air pressure in the casing 20. Thus any air which enters the crank chamber is compelled to do so through the various interstices at the joints thereof. This is generally found sutticient to produce the desired Cooling effeet, and at the same time maintainsithe average pressure within the crank chamber 11 slightly less than that of the atmosphre. This diminished pressure within the crank chamber is found to be advantageous in assisting lubrication, and also inkeeping the exterior of the machine tree ot oil. In case the inward leakage of air through the interstices at the joint-s of the crank chamber is not suficient in any case to provide the desired amount of air, an inwardly opening check valve 45 having a rather stit closing spring may be connected with the crank chamber to admit air to the latter from the atmosphere.' Usually, however, such a valve is not necessary.

What I claim as new isf:

1. In combination, a reciprocating engine having a crank chamber, a breather connected to the crank chamber to .allow the air to escape therefrom when compressed by the piston action, said breather comprising a battle plate and a strainer for removing oil from the air passing out from the crank case. and a valve for preventing the passage of air through the breather into the crank chamber.

2. In combination, a reciprocating engine having a crank chamber, a breather connected to the. crank chamber to allow the air to escape therefrom when compressed by the piston action, said breather comprising afstrainer for removing oil from the air passing out from the crank case, and a valve for preventing the passage of air through the breather into the crank chamber.

3. In combination, a reciprocating engine having a crank chamber, a breather connected to the crank chamber to allow the air to escape therefromV when compressed by the piston action, said breather comprising a battle plate for removing oil from the air passing out from the crank case, and a valve for preventing the passage of air through the breather into the crank chamber.

4. In combination, a reciprocating engine having a crank chamber, a breather connected to the crank chamber to allow the air to escape therefrom when compressed by the piston action, said breather comprising means for removing oil from such air, and a pipe leading from the bottom of such breather into' the bottom of t-he crank chamber for conducting such oil back to the latter, said pipe being separate from the connection allowing air to escape from the crank chamber through the breather.

5. In combination, a reciprocating engine having a crank chamber, and a breather connected to the crank chamber to allow the air to escape therefrom when compressed by the piston action, said breather comprising means for removing oil from such air, and a pipe leading `from the bottom of such breather into the bottom of the crank chamber for conducting such oil back to the latter, said pipe having a check valve which permits tlow of oil toward the crank chamber only.

6. In combination, an internal combustion to the bottom of the crank chamber for con-I ducting s'uch oil back to the latter.

7. A breather for vproducing a change` of air within the crank/chamber of reciprocatingenginescompr/ising a casing provided wlth an opening, an inwardlyv opening check valve cont-rolling such opening, an annular battle plate within and spaced from such casing and opening into suchtcasing at orte end, a tapered screen across the opening through said annular battle plate, a second ,casing into which the other end of said annular battle plate opens, a battle plate within said second casing and against which air coming from the annular battle plate strikes, l

an air discharge pipe leading fromv said secn ond casing on the other side of the battle plate therein from the annular baille plate, and means for collecting the oil which gathers on the various parts.

8. A breather for producing a change of air Within the crank Chamber of reciprocat ing engines, comprising a casing provided with an opening, an inwardly opening check valve controlling suchopening, an annular baffle plate Within and spaced from such casing and opening into such casing at one end, a screen across the opening through said annular baille plate, a second casing into which the other end of said annular baille plate opens, a battle plate Within said second casing and against which air coming from the annular battle plate strikes, an air discharge pipe leading from said second Casin on the other side of the baille plate thereln from the annular baille plate, and means for collecting the oil which gathers on the various parts.

In witness whereof, I have lhereunto set my hand and seal at Indianapolis, Indiana,

this thirteenth day of May, A. D. onethousand nine hundred and twelve. Y A

NORMAN MCCARTY. '[Lsf'] Witnesses:

G. B. SCHLEY, FRANK A. FAHLE. 

